manifest: change changectx to access manifest via manifestlog
This is the first place where we'll start using manifestctx instances instead of
manifestdict. This will facilitate using different manifestctx implementations
in the future.
#require test-repo
$ . "$TESTDIR/helpers-testrepo.sh"
$ cd "$TESTDIR"/..
New errors are not allowed. Warnings are strongly discouraged.
$ hg files "set:(**.py or **.txt) - tests/**" | sed 's|\\|/|g' |
> python contrib/check-config.py